/**
 * Copyright (c) 1997-2013, www.tinygroup.org (luo_guo@icloud.com).
 * <p/>
 * Licensed under the GPL, Version 3.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p/>
 * http://www.gnu.org/licenses/gpl.html
 * <p/>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.tinygroup.tinysqldsl.expression;

import org.tinygroup.tinysqldsl.base.StatementSqlBuilder;

/**
 * A clause of following syntax: WHEN condition THEN expression. Which is part
 * of a CaseExpression.
 * 
 */
public class WhenClause implements Expression {

	private Expression whenExpression;
	private Expression thenExpression;

	/**
	 * @return Returns the thenExpression.
	 */
	public Expression getThenExpression() {
		return thenExpression;
	}

	/**
	 * @param thenExpression
	 *            The thenExpression to set.
	 */
	public void setThenExpression(Expression thenExpression) {
		this.thenExpression = thenExpression;
	}

	/**
	 * @return Returns the whenExpression.
	 */
	public Expression getWhenExpression() {
		return whenExpression;
	}

	/**
	 * @param whenExpression
	 *            The whenExpression to set.
	 */
	public void setWhenExpression(Expression whenExpression) {
		this.whenExpression = whenExpression;
	}

	public String toString() {
		return "WHEN " + whenExpression + " THEN " + thenExpression;
	}

	public void builderExpression(StatementSqlBuilder builder) {
		StringBuilder buffer = builder.getStringBuilder();
		buffer.append("WHEN ");
		getWhenExpression().builderExpression(builder);
		buffer.append(" THEN ");
		getThenExpression().builderExpression(builder);
		buffer.append(" ");
	}
}
